US6979923B2 - Motor having dynamic pressure fluid bearing and disc drive apparatus provided with the motor - Google Patents
Motor having dynamic pressure fluid bearing and disc drive apparatus provided with the motor Download PDFInfo
- Publication number
- US6979923B2 US6979923B2 US10/965,886 US96588604A US6979923B2 US 6979923 B2 US6979923 B2 US 6979923B2 US 96588604 A US96588604 A US 96588604A US 6979923 B2 US6979923 B2 US 6979923B2
- Authority
- US
- United States
- Prior art keywords
- shaft
- motor
- dynamic pressure
- pressure fluid
- fluid bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/10—Construction relative to lubrication
- F16C33/1025—Construction relative to lubrication with liquid, e.g. oil, as lubricant
- F16C33/103—Construction relative to lubrication with liquid, e.g. oil, as lubricant retained in or near the bearing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
- G11B19/20—Driving; Starting; Stopping; Control thereof
- G11B19/2009—Turntables, hubs and motors for disk drives; Mounting of motors in the drive
- G11B19/2018—Incorporating means for passive damping of vibration, either in the turntable, motor or mounting
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
- H02K5/1675—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at only one end of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
- H02K7/08—Structural association with bearings
- H02K7/086—Structural association with bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly
- H02K7/088—Structural association with bearings radially supporting the rotor around a fixed spindle; radially supporting the rotor directly radially supporting the rotor directly
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2370/00—Apparatus relating to physics, e.g. instruments
- F16C2370/12—Hard disk drives or the like
Definitions
- the present invention relates to a motor having a dynamic pressure fluid bearing and a disc drive apparatus provided with the motor.
- a motor which is utilized for a driving apparatus of a disc such as a magnetic disc so as to drive the disc rotatably.
- a motor having a dynamic pressure fluid bearing which is advantageous to NRRO (Non-Repeatable Run-Out) in comparison with a bearing using a conventional ball bearing, enables to be used preferably for such a disc drive apparatus.
- the motor is composed of a shaft section and a sleeve section that is rotatable freely and relatively with respect to the shaft section.
- the shaft section is axially sustained by radial and thrust dynamic pressure fluid bearings.
- the shaft section is provided with a through hole for injecting lubrication fluid and maintaining it therein, wherein the through hole is bored through the shaft section from the top end surface to the bottom end surface.
- an amount of lubricant necessary for lubricating the dynamic pressure fluid bearing may fail to be maintained sufficiently when the amount of lubricant decreased due to exuding of the lubricant diachronically. Consequently, there existed a problem such that it was hard for life of the bearing to be maintained longer or stably.
- an inner wall surface of the through hole for injecting lubricant approximately intersects perpendicularly with a lower end surface of the shaft section. Therefore, in a process of manufacturing motors, when lubricant is injected into the through hole through an open hole provided in a top end portion of the through hole, air is easily led into the lubricant, and resulting in tending to remain bubbles in the lubricant.
- the bubbles once let into the lubricant are blocked by a bottom end surface of the shaft section and hardly released from the lubricant to the outside of the shaft section through the through hole.
- the remaining bubbles resulted in another problem such that the lubricant disabled to fulfil its performances sufficiently, and resulting in failing to ensure prescribed performances of the dynamic pressure fluid bearing, or that burning between the bearing and the shaft section easily occurred, and resulting in shortening the motor life.
- an object of the present invention is to provide a motor having a dynamic pressure fluid bearing and a disc drive apparatus provided with the motor, wherein the motor is easy to assemble, maintains an amount of lubricant sufficiently, is long in life, and ensures prescribed performances stably for a long period of time.
- a motor having a dynamic pressure fluid bearing comprising: a hub; a rotor provided with a shaft of which one end portion is securely fastened by the hub and another end portion is formed with a flange; and a stator composed of a sleeve for axially sustaining the shaft so as to be rotatable freely and a thrust plate secured on the sleeve so as to confront with the flange, wherein the dynamic pressure fluid bearing is composed of a thrust dynamic pressure fluid bearing constituted by the flange and the thrust plate, and wherein the shaft is provided with a through hole that is bored through the shaft from the one end surface to the other end surface, and wherein the through hole is formed in a shape having an opening to the other end surface of the shaft by way of a funnel shaped section of which diameter gradually increases toward the other end surface of the shaft.
- FIG. 1 is a cross sectional view of a motor having a dynamic pressure fluid bearing according to a first embodiment of the present invention.
- FIG. 2( a ) exhibits a first step of an assembling process of the motor having the dynamic pressure fluid bearing shown in FIG. 1 , wherein a shaft is inserted into a hole of a sleeve section.
- FIG. 2( b ) exhibits a second step of the assembling process of the motor, wherein lubricant is injected into a through hole of the shaft mounted in the sleeve section.
- FIG. 2( c ) exhibits a third step of the assembling process of the motor, wherein a hub is mounted on a stator.
- FIG. 3 is a cross sectional view of a motor having a dynamic pressure fluid bearing according to a second embodiment of the present invention.
- FIG. 4 is a perspective view of a disc drive apparatus mounted with the motor shown in FIG. 1 or FIG. 3 according to a third embodiment of the present invention.
- FIG. 1 is a cross sectional view of a motor having a dynamic pressure fluid bearing according to a first embodiment of the present invention.
- FIGS. 2( a ) to 2 ( c ) are drawings for explaining an assembling process of the motor having the dynamic pressure fluid bearing shown in FIG. 1 .
- a motor 100 having a dynamic pressure fluid bearing is composed of a stator 3 and a rotor 4 .
- the rotor 4 is further composed of a hub 2 , a rotor yoke 5 that is fixed inside a hollow portion provided on a bottom of the hub 2 , a magnet 6 that is securely adhered inside the rotor yoke 5 , and a shaft 7 of which one end portion is force-fitted into a hole 2 a provided in a middle of the hub 2 .
- a disc 30 such as a recording medium in disciform and a magnetic disc is securely mounted on the hub 2 of the motor 100 .
- the rotor 4 is formed by cutting ingot aluminum.
- the rotor yoke 5 is formed by iron, and nickel plating is conducted on a surface of the rotor yoke 5 .
- electrodeposition coating is applied on a surface of the magnet 6 .
- the shaft 7 is made by aluminum, zinc, or like, and the other end portion of the shaft 7 opposite to the end portion force-fitted into the hub 2 is formed with a flange 8 in one piece.
- stator 3 is provided with a sleeve section 9 having a hole 9 a for axially sustaining the shaft 7 .
- the stator 3 is composed of a motor base 12 that is formed together with the sleeve section 9 in one piece, a core 13 that is affixed on an outer circumferential surface of the sleeve section 9 , wherein a coil 14 is wound around the core 13 , and a thrust plate 10 that is affixed on a lower end portion of the hole 9 a by glue 11 so as to seal a bottom opening of the hole 9 a.
- the motor base 12 is formed by aluminum diecasting, and a cutting process is applied on predetermined portions thereof.
- the core 13 is made by laminating a thin plate of silicon steel and insulation coating is applied on the surface of the core 13 by a coating method such as the electrodeposition coating method and the powder coating method.
- the thrust plate 10 is made by a stainless material.
- a lead wire 14 a of the coil 14 is passed through a through hole 12 b , which is provided on the motor base 12 , and electrically connected to a wiring pattern that is formed on a flexible printed circuit board (hereinafter referred to as FPC) 15 , which is firmly mounted on a bottom of the motor base 12 , by soldering.
- FPC flexible printed circuit board
- the wiring pattern of the FPC 15 is electrically connected to a driving circuit 40 to be provided in a disc drive apparatus through a connector 16 .
- a driving circuit 40 By turning on electricity supplied to the driving circuit 40 , the motor 100 is activated, and resulting in rotating the rotor 4 with respect to the stator 3 .
- Top and bottom end surfaces of the flange 8 are formed with a thrust dynamic pressure groove (not shown) such as herringbone and Rayleigh step so as to generate dynamic pressure.
- the thrust dynamic pressure groove enables to be formed by a processing method such as etching and stamping.
- a gap between a bottom end surface 7 b of the flange 8 and the top surface of the thrust plate 10 is filled with lubricant (oil) 21 to be detailed later, wherein the lubricant 21 is hermetically sealed in the gap approximately.
- a thrust dynamic pressure fluid bearing is constituted.
- the thrust dynamic pressure fluid bearing sustains the rotor 4 in the thrust direction by dynamic pressure that is accompanied by rotative motion of the rotor 4 on the basis of the sleeve section 9 , the thrust dynamic pressure groove, the thrust plate 10 , and the lubricant 21 .
- an outer circumferential area of the shaft 7 or an inner wall surface of the hole 9 a in the sleeve section 9 is formed with a radial dynamic pressure groove such as herringbone and Rayleigh step, which is provided for generating dynamic pressure in the radial direction, as shown by herringbone patterns in FIG. 1 .
- the radial dynamic pressure groove also enables to be formed by the processing method such as etching and stamping.
- a gap between the outer circumferential area of the shaft 7 and the inner wall surface of the hole 9 a of the sleeve section 9 is filled with the lubricant (oil) 21 that is hermetically sealed therein approximately.
- a radial dynamic pressure fluid bearing is constituted.
- the radial dynamic pressure fluid bearing sustains the rotor 4 in the radial direction by dynamic pressure that is accompanied by rotative motion of the dynamic pressure groove and the rotor 4 on the basis of the lubricant 21 , the radial dynamic pressure groove, and either the shaft 7 or the sleeve section 9 that confronts with the radial dynamic pressure groove.
- the shaft 7 is formed with a through hole 17 in the axial direction.
- the through hole 17 is formed with a large diameter section 17 a having a first diameter in a top end portion opposite to a bottom end portion formed with the flange 8 by way of boring in a top end surface 7 a of the shaft 7 .
- the other end portion of the shaft 7 formed with the flange 8 is provided with a small diameter section 17 b having a second diameter that is smaller than the first diameter.
- bottom end surface 7 b of the shaft 7 or the flange 8 is formed with a tapered opening section (funnel shaped section) 17 c of which opening mouth opens in funnel shape approximately.
- exemplary dimensions are as follows: an outer diameter of the shaft 7 is 4.0 mm ( ⁇ 4.0), the first diameter is ⁇ 2.0, the second diameter is ⁇ 1.0, an opening mouth diameter 17 e of the tapered opening section 17 c is ⁇ 3.0, and an angle ⁇ of the tapered opening is 120 degrees.
- a prescribed amount of the lubricant 21 is injected into the through hole 17 as much as a fluid level of the lubricant 21 reaches to the large diameter section 17 a .
- the lubricant 21 injected into the through hole 17 is supplied as lubricant for lubricating the above-mentioned radial and thrust dynamic pressure fluid bearings.
- the lubricant 21 is sealed by an elastic member 18 that is force-fitted into the large diameter section 17 a.
- binding agent (sealant) 22 is injected on the top surface of the elastic member 18 press-fitted in the large diameter hole 17 a of the through hole 17 . Consequently, the elastic member 18 is adhered and fastened to the inner wall surface of the large diameter section 17 a by the binding agent 22 , and resulting in sealing the lubricant 21 in the through hole 17 perfectly.
- a spherical elastomeric material for example, enables to be used for the elastic member 18 .
- a material for the elastic member 18 is not limited to the elastomeric material.
- the lubricant 21 tends to expand or shrink by change of ambient temperature. However, elasticity of the elastic member 18 appropriately absorbs expansion or shrinkage of the lubricant 21 , so that the lubricant 21 enables to be sealed securely and stably in the through hole 17 for a long period of time without being affected by surroundings.
- FIG. 2( a ) exhibits a first step of an assembling process of the motor having the dynamic pressure fluid bearing shown in FIG. 1 , wherein the shaft is inserted into the hole of the sleeve section.
- FIG. 2( b ) exhibits a second step of the assembling process of the motor, wherein lubricant is injected into the through hole of the shaft mounted in the sleeve section.
- FIG. 2( c ) exhibits a third step of the assembling process of the motor, wherein the hub is mounted on the stator.
- the shaft 7 is inserted into the hole 9 a of the sleeve section 9 that is formed with the motor base 12 in one piece through the bottom end opening of the hole 9 a.
- the thrust plate 10 is adhered on the bottom end portion of the hole 9 a of the sleeve section 9 by the binding agent 11 , and then a prescribed amount of the lubricant 21 is injected into the through hole 17 from the top end opening of the through hole 17 .
- the elastic member 18 is press-fitted into the large diameter section 17 a of the through hole 17 from the top end opening of the through hole 17 as deep as the elastic member 18 reaches at a predetermined position so as to make the lubricant 21 to be sealed temporally.
- the coil 14 that is wound around the core 13 is mounted on the sleeve section 9 .
- the lead wire 14 a of the coil 14 is passed through the through hole 12 b of the motor base 12 , and soldered on the FPC 15 so as to be connected to the driving circuit 40 (not shown) of a disc drive apparatus to be described later through the connector 16 .
- the hub 2 is fixed to the top portion of the shaft 7 by force-fitting the hole 2 a of the hub 2 to the shaft 7 , and resulting in integrating the hub 2 and the shaft 7 as the rotor 4 .
- the lubricant 21 never leaks out from the through hole 17 when the lubricant 21 is injected therein, so that an extra process for wiping off leaked lubricant is not necessary. Consequently, the manufacturing process is high in productivity, and resulting in enabling to manufacture motors in lower cost.
- providing the large diameter section 17 a as against the small diameter section 17 b ensures not only giving an indication of an injection amount of the lubricant 21 but also preventing the lubricant 21 from being injected excessively because fluid level in the large diameter section 17 a rises more slowly than fluid level in the small diameter section 17 b , which rises rapidly, when lubricant 21 is injected into the through hole 17 . Consequently, providing the large diameter section 17 a is excellent in workability.
- FIG. 3 is a cross sectional view of a motor having a dynamic pressure fluid bearing according to a second embodiment of the present invention.
- a motor 100 A according to the second embodiment of the present invention is identical to the motor 100 according to the first embodiment except for a shaft 7 A. Consequently, the same components as those of the motor 100 are indicated by the same reference sings as those of the motor 100 , and their details are omitted.
- the motor 100 A is composed of the stator 3 and a rotor 4 A.
- the rotor 4 A is provided with the shaft 7 A of which one end portion is force-fitted into the hole 2 a of the hub 2 .
- the shaft 7 A is formed with a through hole 17 A.
- the through hole 17 A of the shaft 7 A according to the second embodiment is different from the through hole 17 of the first embodiment in configurations.
- the through hole 17 A is provided with a first large diameter section 17 Aa, a second large diameter section 17 Ad that is provided above the first large diameter section 17 Aa adjacent to a top opening end of the through hole 17 A, the small diameter section 17 b , and the tapered opening section 17 c .
- a diameter of the second large diameter section 17 Ad is larger than that of the first large diameter section 17 Aa and enables to be assigned to ⁇ 3, for example, in case a diameter of the first large diameter section 17 Aa is defined to be ⁇ 2.
- the elastic member 18 is not utilized.
- lubricant 21 A is sealed in the through hole 17 A by sealant (binding agent) 22 A that is injected into the second large diameter section 17 Ad.
- the lubricant 21 A filled in the through hole 17 A ensures a necessary amount of lubricant for lubricating a dynamic pressure fluid bearing.
- the tapered opening section 17 c provided on the bottom end surface 7 b of the shaft 7 A is utilized for conducting bubbles let in the lubricant 21 A to the through hole 17 A efficiently as well as compensating a necessary amount of the lubricant 21 A, wherein the bubbles are let in the lubricant 21 A when the lubricant 21 A is injected into the through hole 17 A, and remain in the gap between the bottom end surface 7 b of the shaft 7 A and the top surface of the thrust plate 10 .
- the bubbles that are conducted to the through hole 17 A are released from fluid level of the lubricant 21 A to outside air, and resulting in being removed from the lubricant 21 A.
- the opening mouth diameter 17 e of the tapered opening section 17 c it is necessary for the opening mouth diameter 17 e of the tapered opening section 17 c to be set as large as possible.
- an area confronting with the thrust plate 10 reduces as much, and resulting in reducing an area of a dynamic pressure groove.
- the opening mouth diameter 17 e is desirable for the opening mouth diameter 17 e to be set so as to ensure necessary performances of a thrust dynamic pressure fluid bearing in consideration of the outer diameter of the flange 8 .
- the opening mouth diameter 17 e enables to be enlarged as large as the outer diameter of the shaft 7 A is. Enlarging the opening mouth diameter 17 e as large as the outer diameter of the shaft 7 A is the most desirable configuration.
- the opening mouth diameter 17 e shall be ⁇ 4.0 in case the outer diameter of the shaft 7 A is defined as ⁇ 4.0.
- a shape of the tapered opening section 17 c it is not necessary for a shape of the tapered opening section 17 c to be a conical shape. It is acceptable for a shape of the tapered opening section 17 c to be an approximate cone shape of which curvature of a surface is not constant or changes. A cone shape, that is, a shape having chamfered corner in cross section is most desirable for the tapered opening section 17 c.
- the angle ⁇ of the tapered opening section 17 c shown in FIG. 1 is defined as 120 degrees in the first embodiment. However, it should be understood that the angle ⁇ is not limited to 120 degrees.
- the angle ⁇ of the tapered opening section 17 c is desirable to be larger in accordance with thickness of the flange 8 as far as strength of the shaft 7 A is not deteriorated.
- the lubricant 21 or 21 A is filled in not only the through hole 17 or 17 A but also the gap between the tapered opening section 17 c and the thrust plate 10 , so that a sufficient amount of the lubricant is always supplied to the thrust and radial dynamic pressure fluid bearing sections.
- initial performances enable to be ensured for a long period of time without being affected by lubricant of which amount decreases due to exuding of lubricant diachronically.
- a coefficient of linear expansion of the sleeve section 9 is made smaller than that of the shaft 7 or 7 A by selecting their materials as mentioned below.
- FIG. 4 is a perspective view of a disc drive apparatus that is mounted with the motor shown in FIG. 1 or FIG. 2 according to a third embodiment of the present invention.
- a disc drive apparatus 75 is composed of a chassis 70 , a motor 72 , and a recording and reproducing device 73 for recording or reproducing information on the disc 30 .
- the motor 72 is mounted with the disc 30 or a recording medium such as a magnetic disc for recording information, wherein the disc 30 is mounted on the hub 2 of the motor 72 .
- the motor 100 or 100 A having the dynamic pressure fluid bearing according to the first or second embodiment of the present invention is utilized for the motor 72 .
- a motor having a dynamic pressure fluid bearing exhibits effects such as long life, easy to assemble, and enabling to achieve performances stably for a long period of time.
- a disc drive apparatus provided with the motor having the dynamic pressure fluid bearing as mentioned above is long in life and enables to achieve performances stably for a long period of time.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Sliding-Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Rotational Drive Of Disk (AREA)
Abstract
Description
Claims (2)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003362888A JP2005127405A (en) | 2003-10-23 | 2003-10-23 | Dynamic pressure fluid bearing motor, and disk driving device provided with same |
JP2003-362888 | 2003-10-23 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20050088050A1 US20050088050A1 (en) | 2005-04-28 |
US6979923B2 true US6979923B2 (en) | 2005-12-27 |
Family
ID=34510007
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/965,886 Expired - Fee Related US6979923B2 (en) | 2003-10-23 | 2004-10-18 | Motor having dynamic pressure fluid bearing and disc drive apparatus provided with the motor |
Country Status (3)
Country | Link |
---|---|
US (1) | US6979923B2 (en) |
JP (1) | JP2005127405A (en) |
KR (1) | KR100618371B1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060192452A1 (en) * | 2004-07-09 | 2006-08-31 | Yasunori Tokuno | Spindle motor |
US20060221495A1 (en) * | 2005-02-25 | 2006-10-05 | Nidec Corporation | Motor Unit and Recording Disk Driving Device |
US20080211334A1 (en) * | 2004-07-09 | 2008-09-04 | Yasunori Tokuno | Spindle motor |
US9086858B2 (en) | 2013-11-26 | 2015-07-21 | HGST Netherlands B.V. | System, method and apparatus for disk drive fluid dynamic bearing |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4571593B2 (en) * | 2006-01-30 | 2010-10-27 | アルファナテクノロジー株式会社 | motor |
TWI337437B (en) * | 2006-12-22 | 2011-02-11 | Delta Electronics Inc | Fan, motor and fixture thereof |
JP2013179727A (en) * | 2012-02-28 | 2013-09-09 | Samsung Electromechanics Japan Advanced Technology Co Ltd | Rotary apparatus |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58200816A (en) * | 1982-05-14 | 1983-11-22 | Nippon Seiko Kk | Dynamic pressure gas bearing device for rotary unit |
US5713670A (en) * | 1995-08-30 | 1998-02-03 | International Business Machines Corporation | Self pressurizing journal bearing assembly |
JPH1080091A (en) | 1996-09-05 | 1998-03-24 | Nippon Densan Corp | Dynamic pressure fluid bearing device and motor provided with the device |
US6005748A (en) * | 1997-04-23 | 1999-12-21 | Seagate Technology, Inc. | Spindle motor with multiple thrust plate fluid dynamic bearing |
US6034454A (en) * | 1998-03-26 | 2000-03-07 | Nidec Corporation | Motor |
US6137650A (en) * | 1997-04-24 | 2000-10-24 | Seagate Technology L.L.C. | Spindle motor with fluid dynamic bearing having a journal bearing in combination with a conical bearing |
US6195895B1 (en) * | 1997-03-13 | 2001-03-06 | Seagate Technology Llc | Hydrodynamic bearing arrangement having a structure permitting the removal of entrapped air |
JP2003125553A (en) | 2001-10-15 | 2003-04-25 | Sony Corp | Spindle motor and information recording/reproducing apparatus |
US6678115B2 (en) * | 2001-11-08 | 2004-01-13 | Seagate Technology Llc | Hydrodynamic fluid bearing containing lubricants with reduced bubble forming tendency for disk drive application |
-
2003
- 2003-10-23 JP JP2003362888A patent/JP2005127405A/en active Pending
-
2004
- 2004-09-17 KR KR1020040074460A patent/KR100618371B1/en not_active IP Right Cessation
- 2004-10-18 US US10/965,886 patent/US6979923B2/en not_active Expired - Fee Related
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58200816A (en) * | 1982-05-14 | 1983-11-22 | Nippon Seiko Kk | Dynamic pressure gas bearing device for rotary unit |
US5713670A (en) * | 1995-08-30 | 1998-02-03 | International Business Machines Corporation | Self pressurizing journal bearing assembly |
JPH1080091A (en) | 1996-09-05 | 1998-03-24 | Nippon Densan Corp | Dynamic pressure fluid bearing device and motor provided with the device |
US6195895B1 (en) * | 1997-03-13 | 2001-03-06 | Seagate Technology Llc | Hydrodynamic bearing arrangement having a structure permitting the removal of entrapped air |
US6005748A (en) * | 1997-04-23 | 1999-12-21 | Seagate Technology, Inc. | Spindle motor with multiple thrust plate fluid dynamic bearing |
US6069768A (en) * | 1997-04-23 | 2000-05-30 | Seagate Technology, Inc. | Spindle motor with multiple thrust plate fluid dynamic bearing |
US6137650A (en) * | 1997-04-24 | 2000-10-24 | Seagate Technology L.L.C. | Spindle motor with fluid dynamic bearing having a journal bearing in combination with a conical bearing |
US6034454A (en) * | 1998-03-26 | 2000-03-07 | Nidec Corporation | Motor |
JP2003125553A (en) | 2001-10-15 | 2003-04-25 | Sony Corp | Spindle motor and information recording/reproducing apparatus |
US6678115B2 (en) * | 2001-11-08 | 2004-01-13 | Seagate Technology Llc | Hydrodynamic fluid bearing containing lubricants with reduced bubble forming tendency for disk drive application |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20060192452A1 (en) * | 2004-07-09 | 2006-08-31 | Yasunori Tokuno | Spindle motor |
US20080211334A1 (en) * | 2004-07-09 | 2008-09-04 | Yasunori Tokuno | Spindle motor |
US20060221495A1 (en) * | 2005-02-25 | 2006-10-05 | Nidec Corporation | Motor Unit and Recording Disk Driving Device |
US7593182B2 (en) * | 2005-02-25 | 2009-09-22 | Nidec Corporation | Recording disk driving device motor unit having a sheet member attached to a base |
US9086858B2 (en) | 2013-11-26 | 2015-07-21 | HGST Netherlands B.V. | System, method and apparatus for disk drive fluid dynamic bearing |
Also Published As
Publication number | Publication date |
---|---|
US20050088050A1 (en) | 2005-04-28 |
JP2005127405A (en) | 2005-05-19 |
KR20050039552A (en) | 2005-04-29 |
KR100618371B1 (en) | 2006-08-30 |
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